In this security camera footage released by the Port Authority, flooding can be seen from Hurricane Sandy in the Hoboken and Exchange Place (Jersey City) PATH stations. Video provided by Port Authority of New York and New Jersey

A video released Thursday by the Port Authority of New York and New Jersey may go a long way toward explaining why PATH service is still not fully operational nearly three weeks after Hurricane Sandy hit New Jersey.

The video contains security footage of flooding caused by Sandy at the PATH stations in Hoboken and at Exchange Place in Downtown Jersey City.

Both stations remain closed, and Port Authority officials say they don’t know when they’ll be up and running.

Some of the most dramatic footage occurs near the end of the 36-second video, which shows a river of floodwater pouring into Hoboken’s PATH station.

The Mile Square City suffered extensive damage from flooding during Sandy, which caused a two-week shutdown of Hoboken University Medical Center and led to lengthy power outages citywide.